TESTS on LMX2820 45MHz-22.6GHz Wideband Synthesizer Module

[jaudet]

I ran measurements on the LMX2820 Synthesizer Module, as available on EBay and AliExpress.  Will add ALC + Amplifier circuit to stabilize and increase the output.
On my web site:  http://ve2azx.net/technical/LMX2820_Tests.pdf

[EggertEnjoyer123]

The cheap boards suck in terms of phase noise because they copied the loop filter without changing the crystal (which is 10MHz).

The optimum phase noise is achieved by using a high frequency crystal (like 100 MHz), which increases the phase detector frequency.

[max-bit]

Price on aliexpress ~$250

[EggertEnjoyer123]

The price is not worth it, especially since their circuit has mistakes.

The LMX2820 can be bought for around $50 each at LCSC.